25873166591 has 4 divisors (see below), whose sum is σ = 25874316384. Its totient is φ = 25872016800.

The previous prime is 25873166551. The next prime is 25873166603. The reversal of 25873166591 is 19566137852.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25873166591 - 2²⁶ = 25806057727 is a prime.

It is a super-2 number, since 2×25873166591² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25873166551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 540455 + ... + 586376.

It is an arithmetic number, because the mean of its divisors is an integer number (6468579096).

Almost surely, 2^25873166591 is an apocalyptic number.

25873166591 is a deficient number, since it is larger than the sum of its proper divisors (1149793).

25873166591 is a wasteful number, since it uses less digits than its factorization.

25873166591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1149792.

The product of its digits is 2721600, while the sum is 53.

The spelling of 25873166591 in words is "twenty-five billion, eight hundred seventy-three million, one hundred sixty-six thousand, five hundred ninety-one".